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authorPeter Zijlstra <peterz@infradead.org>2015-07-03 19:53:58 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2015-07-03 19:55:00 +0300
commit2ecd9d29abb171d6e97a4f3eb29d7456a11401b7 (patch)
tree2c31785e4dff264db31ee0dea5f74c5d29905898 /include/linux/preempt.h
parent9bdc771f2c29a11920f477fba05a58e23ee42554 (diff)
downloadlinux-2ecd9d29abb171d6e97a4f3eb29d7456a11401b7.tar.xz
sched, preempt_notifier: separate notifier registration from static_key inc/dec
Commit 1cde2930e154 ("sched/preempt: Add static_key() to preempt_notifiers") had two problems. First, the preempt-notifier API needs to sleep with the addition of the static_key, we do however need to hold off preemption while modifying the preempt notifier list, otherwise a preemption could observe an inconsistent list state. KVM correctly registers and unregisters preempt notifiers with preemption disabled, so the sleep caused dmesg splats. Second, KVM registers and unregisters preemption notifiers very often (in vcpu_load/vcpu_put). With a single uniprocessor guest the static key would move between 0 and 1 continuously, hitting the slow path on every userspace exit. To fix this, wrap the static_key inc/dec in a new API, and call it from KVM. Fixes: 1cde2930e154 ("sched/preempt: Add static_key() to preempt_notifiers") Reported-by: Pontus Fuchs <pontus.fuchs@gmail.com> Reported-by: Takashi Iwai <tiwai@suse.de> Tested-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/linux/preempt.h')
-rw-r--r--include/linux/preempt.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 0f1534acaf60..84991f185173 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -293,6 +293,8 @@ struct preempt_notifier {
struct preempt_ops *ops;
};
+void preempt_notifier_inc(void);
+void preempt_notifier_dec(void);
void preempt_notifier_register(struct preempt_notifier *notifier);
void preempt_notifier_unregister(struct preempt_notifier *notifier);